to diffuse; to spread throughout; to prevail; to become widespread; to reach everyone
暖房の熱が部屋全体に行き渡った。
The heat from the heater spread throughout the room.
今では連絡網がどの家庭にも行き渡っている。
Nowadays communication networks have reached every household.
情報が行き渡るのに時間がかかる。
It takes time for information to spread everywhere.